PITCH TYPE FIBROUS ACTIVE CARBON FOR ADSORBING GAS PHASE

摘要

PROBLEM TO BE SOLVED: To obtain a pitch type fibrous active carbon with a narrow pore distribution and a small mean pore radius and being suitable for adsorbing gas phase. ;SOLUTION: A fibrous active carbon prepd. by using pitch as a raw material and with a controlled pore distribution is provided. In this pore distribution, R (a mean pore radius) expressed by [total pore vol. (measured by means of a low temp. nitrogen adsorption method at a liq. nitrogen temp.)/specific surface area (measured by means of the BET method)]×2 is R=5-12 Å and the pore vol. (measured by means of the low temp. nitrogen adsorption method at a liq. nitrogen temp.) existing in radius of 10-20 Å is 2-8% of the total pore vol. and the pore vol. existing in radius of 20-30 Å is 0-5% of the total pore vol. and the radius where the accumulated pore vol (measured by means of the low temp. nitrogen adsorption method at a liq. nitrogen temp.) converges is at most 50 Å.;COPYRIGHT: (C)1999,JPO